This is really the only one that comes close to comparable to Bitcointalk. However, its success isn't based on its quality, in fact I would say that its popularity is because of its lack of quality. The platform is designed mainly for lower quality content, and has a visibility feature which is easily abused. However, out of the ones you listed its the closest one that comes to Bitcointalk's goal, and that's quality based discussion. Don't get me wrong Reddit can have quality discussion, but because of its nature it tends to encourage lower based quality.